more info on the IRL motors and IMSA versions
"" However, the IRL engine is roughly speaking a "sillhouette motor": while it resembles a production Northstar, it is actually smaller in every exterior dimension and none of the parts interchange. GM and the IRL did an excellent job of selling the engine as "production-based," which I suppose it was given the elasticity of that term.
Before the IRL engine, there was an Oldsmobile IMSA road racing version of the Northstar which was a sort of middle step. Some of those parts may fit a production Northstar, but I don't know that or which and these pieces would have to be pretty rare by now. There aren't a lot of aftermarket parts available for the production Northstar V8 either, probably due to the difficulties in converting its somewhat goofy accessory layout to a North/South RWD application. (the water pump drives off the LR cam cover, the intake is backward, etc.) I have done it and it's not a lot of fun, nor does it produce a very aesthetically pleasing package when all is said and done, say for a street rod or similar application. To me the race engine would be the way to go, provided it fits the budget."
btw the quotes are from atlas F-1 teck forum and the guy quoted is a race insider who posts good info
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Question wonder and be wierd
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